<s>
The	O
perceptual	B-Algorithm
quantizer	I-Algorithm
(	O
PQ	B-Algorithm
)	O
,	O
published	O
by	O
SMPTE	O
as	O
SMPTE	B-Algorithm
ST	I-Algorithm
2084	I-Algorithm
,	O
is	O
a	O
transfer	B-Algorithm
function	I-Algorithm
that	O
allows	O
for	O
HDR	B-Application
display	I-Application
by	O
replacing	O
the	O
gamma	O
curve	O
used	O
in	O
SDR	B-Device
.	O
</s>
<s>
ITU	O
specifies	O
the	O
use	O
of	O
PQ	B-Algorithm
or	O
HLG	O
as	O
transfer	O
functions	O
for	O
HDR-TV	B-Application
.	O
</s>
<s>
PQ	B-Algorithm
is	O
the	O
basis	O
of	O
HDR	B-Application
video	I-Application
formats	O
(	O
such	O
as	O
Dolby	B-Device
Vision	I-Device
,	O
HDR10	B-Device
and	O
HDR10+	B-Device
)	O
and	O
is	O
also	O
used	O
for	O
HDR	B-Application
still	O
picture	O
formats	O
.	O
</s>
<s>
PQ	B-Algorithm
is	O
not	O
backward	O
compatible	O
with	O
the	O
BT.1886	B-Algorithm
EOTF	B-Algorithm
(	O
i.e.	O
</s>
<s>
the	O
gamma	O
curve	O
of	O
SDR	B-Device
)	O
,	O
while	O
HLG	O
is	O
compatible	O
.	O
</s>
<s>
PQ	B-Algorithm
is	O
a	O
non-linear	O
transfer	B-Algorithm
function	I-Algorithm
based	O
on	O
the	O
human	O
visual	O
perception	O
of	O
banding	B-Algorithm
and	O
is	O
able	O
to	O
produce	O
no	O
visible	O
banding	B-Algorithm
in	O
12	O
bits	O
.	O
</s>
<s>
A	O
power	O
function	O
(	O
used	O
as	O
EOTFs	B-Algorithm
in	O
standard	B-Device
dynamic	I-Device
range	I-Device
applications	O
)	O
extended	O
to	O
10000	O
cd/m2	O
would	O
have	O
required	O
15	O
bits	O
.	O
</s>
<s>
The	O
PQ	B-Algorithm
EOTF	B-Algorithm
(	O
electro-optical	B-Algorithm
transfer	I-Algorithm
function	I-Algorithm
)	O
is	O
as	O
follows	O
:	O
</s>
<s>
The	O
PQ	B-Algorithm
inverse	O
EOTF	B-Algorithm
is	O
as	O
follows	O
:	O
</s>
